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CALCHDMSTR - CALET CHarge Detector (CHD) Master Catalog



The CALCHDMSTR database table records high-level information of the lightcurves obtained with the CHarge Detector (CHD), the top layer of the calorimeter instrument on the CALorimetric Electron Telescope (CALET) mission.

CALET is a Japanese mission led by JAXA, in collaboration with the Italian Space Agency (ASI) and NASA, and is dedicated to the study of high energy cosmic rays. CALET was launched on August 19, 2015, by a Japanese carrier, H2 Transfer Vehicle, and robotically installed on the Japanese Experiment Module-Exposed Facility (JEM-EF) on the International Space Station (ISS). CALET started scientific observations in October, 2015.

Catalog Bibcode



On-orbit operations and offline data processing of CALET onboard the ISS.
    Asaoka Y. et al., 2018, Astrophysical Particle, 100 29a


The CALET CHD lightcurves are delivered by the CALET team in Japan as ASCII files to the DARTS archive located at ISAS (Japan). The HEASARC developed software to create the FITS versions of the lightcurves. This is run at DARTS, and the output is placed online at The HEASARC hosts a copy of these lightcurves and generates this database table by collecting high-level information from the data. The Data and the database table are updated regularly during operation.


The CALET mission is comprised of two detectors: the calorimeter (named CALET) and the Gamma Ray Burst Monitor (Tori S. and CALET Collaboration, 2017, ICRC, 35, 1092).

The CALET detector consists of a CHarge Detector (CHD), which identifies the charge of the incident particle in an IMaging Calorimeter (IMC). The IMC reconstructs the track of the incident particle and finely images the initial shower development, and a Total AbSorption Calorimeter (TASC), which absorbs the entire energy of the incoming particle and identifies the particle species using hodoscopic scintillator arrays. The calorimeter directly measures the cosmic ray electron spectrum in the energy range of 1 GeV to 20 TeV.

The CHD is double-layered (X, Y), placed at the top, above the IMC detector. The signals from the X and Y layers are integrated over 1 second and used to create the 1-day lightcurves associated with this database table.

Each row of the database table corresponds to a specific day and has an associated lightcurve. Each record also includes the minimum, maximum, and average of the lightcurve.


This parameter contains a unique row identifier for the database table. It is a 8-digit number, YYYYMMDD, representing the year, month and day of the lightcurve. It is also used to name the lightcurves.

The start time of the lightcurve. The data have been divided into 1-day observations. This time corresponds to the start of the day.

The end time of the lightcurve. The data have been divided into 1-day observations. This time corresponds to the end of the day.

This parameter corresponds to the total effective exposure recorded in the 1-day time interval lightcurve.

This parameter records the date when the data were last processed.

This records the version of the processing script used in the pipeline to generate the data products for the observation.

Records the mean value of the count rate in the 1-day lightcurve.

Records the minimum value of the count rate in the 1-day lightcurve.

Records the maximum value of the count rate in the 1-day lightcurve.

Contact Person

Questions regarding the CALCHDMSTR database table can be addressed to the HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Wednesday, 04-Dec-2019 16:27:59 EST